I am trying to install Ubuntu 12.04 LTS dual boot with Windows 7, but when i click on Try or even Install ubuntu, i am getting black screen only. I can't see any text or anything else.
When i see my Laptop's screen from close look, ubuntu in the middle of screen shown but screen is dark black. So because of this i am unable to install Ubuntu on my laptop. Please help in this regard.
Following deatails of my laptop.

1 Answer
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On boot, press Esc to get the language-selection screen. Press Enter to select English. Press F6, which gives you a menu. Press Esc to dismiss that menu. Then you can use the arrow keys to edit the Boot Options and (e.g.) add "nomodeset".

If "nomodeset" doesn't give you full resolution, you could try deleting "quiet splash --" and adding "drm_kms_helper.poll=0". If that gives you full resolution but with no brightness control, you could try deleting "quiet splash --" and adding "drm_kms_helper.poll=0 acpi_osi=Linux acpi_backlight=vendor" (or maybe "legacy" instead of "vendor").